Due to the strapless cut of her tuxedo playsuit, onlookers were quick to spot circular marks on Jennifer Aniston's back as she stepped out for the premiere of her latest film Call Me Crazy on Tuesday night.
The tell-tale marks were a reult of a detox therapy called 'cupping', a practice that the Hollywood actress, who is engaged to her moviestar beau Justin Theroux, has said to have used for over six years.
An ancient alternative to body pampering, the therapy uses cups which are placed on the skin to extract impurities from the body as well as help with everything from circulation to neck and shoulder pain.
The cups can be made of a variety of materials, including glass, bamboo and earthenware. They are heated and then placed along the back and, as the cups cool, they create a vacuum against the skin which stimulates blood flow. Each cup is generally left in place for five to 10 minutes.
Although it appeared that the actress may have attempted to cover up these round marks with a touch of make-up, the after-effects of 'cupping' mean that the red marks are usually still visible for between three to seven days after treatment.
Jennifer isn't the only star to swear by cupping — other celebrity fans include Gwyneth Paltrow, Jessica Simpson and Jennifer's ex-husband Brad Pitt. Speaking to Oprah about the practice several years ago, Gwyneth said: "It feels amazing and it's very relaxing."
Many users also believe that the treatment has the ability to increase fertility.